#include <REGX52.H>
void Delay(unsigned int xms)	//@12.000MHz
{
	unsigned char data i, j;
    while(xms--)
	{
		i = 2;
	j = 239;
	do
	{
		while (--j);
	} while (--i);
	}
}

unsigned char LEDnum=0;
void main()
{
	while(1)
	{
		if(P3_1==0)
		{
			Delay(20);
			while(P3_1==0);
			Delay(20);
			
			LEDnum++;
			P2=~LEDnum;
			
		}
	}
}